The waves are really a very unique project and a very good way to invest
in the future the value of the waves will be $ 20
Try $70-80. Really, twenty bucks is nothing for waves...
If you consider BTC's ATH ($5900) and waves' ATH (265K satoshis), you already could have acquired 15.6 USD from selling your stuff when they were at their ATHs. If that argument doesn't work for you, you can evaluate its ATH in USD ($7 I think) and consider how easily they got from 18 cents to that price and how much progress they have in front of them.